Effects of Pore Structures of Different Maceral Compositions on Methane Adsorption and Diffusion in Anthracite

Zhao, Jincheng; Qin, Yong; Shen, Jian; Zhou, Binyang; Li, Chao; Li, Geng

doi:10.3390/app9235130

Cited by 25 publications

(11 citation statements)

References 52 publications

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“…On the other hand, the adsorption capacity of non-magnetic diatomites (DE-APTES) was found to be 28.8 and 15.6 mg g −1 with an initial endosulfan concentration of 750 and 100 mg L −1 , respectively (Figure 7). The higher adsorption capacity of m-DE-APTES compared with DE-APTES may be due to the greater effective surface area and pore size (Toprak and Kopac, 2019;Zhao et al, 2019). The effect of temperature was also investigated by altering the temperature from 4 to 40 °C while using different endosulfan concentrations (100-750 mg L −1 ) (Figure 8).…”

Section: Adsorption-desorption Studiesmentioning

confidence: 99%

Endosulfan Elimination Using Amine-Modified Magnetic Diatomite as an Adsorbent

Alacabey

2022

Front. Chem.

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Pesticides are among the most dangerous developing toxins since they are very hazardous to the environment and threaten human health. In this study, researchers successfully manufactured surface-modified magnetic diatomite (m-DE-APTES) and used them as a sorbent to extract endosulfan from an aqueous solution. There is no other study like it in the scholarly literature, and the results are astounding. Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive X-ray (EDX), electron spin resonance (ESR), and surface area measurements were used to analyze magnetic diatomite particles with surface modification. According to the analysis results, magnetic diatomite has a wide surface area and a porous structure. Furthermore, m-DE-APTES has a higher endosulfan adsorption capacity (97.2 mg g−1) than raw diatomite (DE) (16.6 mg g−1). Adsorption statistics agree with Langmuir adsorption isotherm (R2 = 0.9905), and the adsorption occurred spontaneously at −2.576 kj mol−1 in terms of ΔGo. Finally, m-DE-APTES are a viable alternative adsorbent for removing pesticides from aqueous solutions.

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Section: Adsorption-desorption Studiesmentioning

confidence: 99%

Endosulfan Elimination Using Amine-Modified Magnetic Diatomite as an Adsorbent

Alacabey

2022

Front. Chem.

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“…The coal range and the burial depth play a significant role in the adsorption capacity of the methane gas and in the maceral composition (e.g. Laxminarayana and Crosdale 1993; Bustin and Bustin 2016;Li et al 2016;Hou et al 2019;Zhao et al 2019;Busch et al 2019), as well as defining the quality of the coal deposit (Farhaduzzaman et al 2012;Miao 2016in Hou et al 2019. Also, according to the deposit environment, it allows the evaluation of the seal conditions of the adjacent rocks (Li et al 2014).…”

Section: Basin Analysismentioning

confidence: 99%

Coal petrology analysis and implications in depositional environments from upper Cretaceous to Miocene: a study case in the Eastern Cordillera of Colombia

Guatame

Rincón

2021

Int J Coal Sci Technol

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The Piedemonte Llanero Basin is located on the eastern side of the Eastern Cordillera of the Colombian Andes. It has been the subject of numerous geological studies carried out for the oil sector, mainly. This study presents the coal-petrographical features of 15 coal seams of four geological formations from Late Cretaceous to Middle Miocene (Chipaque formation, Palmichal group, Arcillas del Limbo formation, and San Fernando formation). Analysis of 33 samples indicates enrichment in vitrinite, while liptinite and inertinite concentrations vary according to the stratigraphic position. Reflectance indicates that the coal range gradually decreases from highly volatile bituminous C (Chipaque formation) to subbituminous C (San Fernando formation). The microlithotypes with the highest concentrations are clarite and vitrinertoliptite. Maceral composition and coal facies indicate changes in the depositional conditions of the sequence. The precursor peat from Late Cretaceous to Late Paleocene accumulated under limnic conditions followed by telmatic in Late Eocene–Early Miocene. The coal facies indices show wet conditions in forest swamps with variations in the flooding surface, influxes of brackish water and good tissue preservation. The tectonic conditions along the Piedemonte Llanero basin is evident, from post-rift to foreland basin, evidenced by oxic and anoxic periods reflected in the maceral composition and its morphology. The coal environment corresponds to an estuarine system started in the Chipaque formation evolving to the lacustrine conditions in the San Fernando formation.

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“…CT scanning method can be used for non-destructive pore structure testing within the coal sample, but the pores tested are mainly mesopores and macropores. The low-field NMR method can test the nuclei with odd numbers of nucleons, and then can be used to conduct non-destructive sophisticate characterization of the whole process of pore and fracture development in the coal sample [26,27]. The test has a wide range of applications and can measure small, medium, and large holes.…”

Section: Introductionmentioning

confidence: 99%

Study on Magnetic Resonance Characteristics of Coal Sample under Progressive Loads

et al. 2020

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With the characteristics of gradual instability in the supporting pressure area of roadway as the engineering background, this paper aims to explore the evolution law of pore and fracture in the coal sample under progressive loads. The low-field nuclear magnetic resonance (NMR) test was designed and conducted with the coal sample under different axial loads (0, 3, 5, 7, 9, and 11 MPa). The characteristic parameters such as the porosity, the pore size distribution, the transverse relaxation time (T2) distribution curve, and the magnetic resonance image (MRI) were obtained. As the test results show, significant difference in the NMR characteristics of the coal samples can be observed throughout the compaction stage and the elastic stage. In the compaction stage, the porosity of the coal samples decreases slightly; the T2 distribution curve moves to the smaller value as a whole, and the percolation pore (PP) displays a tendency to transform to the adsorption pore (AP). In the elastic stage, the porosity of the coal samples rises gradually as the load increases; the T2 distribution curve moves to the larger value as a whole, and the AP tends to transform to the PP. The MRI shows that some pores and fissures in the coal sample close up and disappear as the load increases gradually, while the main pores and fissures expand and perforate till the macro failure occurs. Compared with one-time loading, the progressive multiple loads can ensure the fracture of the coal sample to develop more fully and the damage degree higher. It indirectly reflects that the instability and failure of the coal under the progressive load has the stage characteristics, verifying that the coal in the supporting pressure area needs to be controlled in advance.

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Effects of Pore Structures of Different Maceral Compositions on Methane Adsorption and Diffusion in Anthracite

Cited by 25 publications

References 52 publications

Endosulfan Elimination Using Amine-Modified Magnetic Diatomite as an Adsorbent

Endosulfan Elimination Using Amine-Modified Magnetic Diatomite as an Adsorbent

Coal petrology analysis and implications in depositional environments from upper Cretaceous to Miocene: a study case in the Eastern Cordillera of Colombia

Study on Magnetic Resonance Characteristics of Coal Sample under Progressive Loads

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